A reasonable tip ensures that someone will accept your order. Nobody is forced to go pick your food up.

I member when restaurants employed drivers that actually delivered reliably without needing to bid for their attention first. Hard to forget since I was one of them!

Hourly pay was regular minimum wage instead of the server level chump change, and when using my own car I received an amount for wear and tear + gas. So in my case tips were actual tips on top of a living wage and even if nobody had tipped it would have been an alright job.

I can’t imagine trying to do the same thing for only tips.